Use After Free in The X11 Project Libx11
CVE-2020-14363
An integer overflow vulnerability leading to a double-free was found in libX11. This flaw allows a local privileged attacker to cause an application compiled with libX11 to crash, or in some cases, result in arbitrary code execution. The highest threat from this flaw is to confidentiality, integrity as well as system availability.
Vulnerability class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (47.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- The X11 Project Libx11 — versions 1.6.12
- X.org Libx11
- Fedoraproject Fedora — versions 33
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/Ruia-ruia/Exploits/blob/master/DFX11details.txt (Third Party Advisory)
- github.com/Ruia-ruia/Exploits/blob/master/x11doublefree.sh (Exploit, Third Party Advisory)
- lists.x.org/archives/xorg-announce/2020-August/003056.html (Vendor Advisory)
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- usn.ubuntu.com/4487-2/ (vendor-advisory, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
Frequently asked questions
- What is CVE-2020-14363?
- CVE-2020-14363 is a high-severity vulnerability in The X11 Project Libx11, classified under Integer Overflow or Wraparound. CVSS score: 7.8/10. Published 2020-09-11.
- How severe is CVE-2020-14363?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2020-14363 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.